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Purdue NanoTechnology Initiative (NTI)
Address: Purdue University, Purdue NanoTechnology Initiative (NTI)
Zip: 47907 Metallic nanoclusters and molecular wires have been studied for some time as two active but distinct fields of research. We have recently been able to combine the expertise from these two fields to fabricate a Linked Cluster Network (LCN) : a two-dimensional superlattice consisting of nanometer-sized gold clusters electronically linked by pi-conjugated organic molecules (right). The procedure is to first form a monolayer of gold nanocrystals of uniform size which are kept from coalescing by encapsulating each gold cluster in an insulating layer of dodecanethiol ((CH3)12-SH). Next we use pi-conjugated molecules, with functional groups that bond strongly to gold at both ends, to displace the single-ended dodecanethiols. Uniform LCN's of up to 1m x 1Хµm in area have been fabricated using gold clusters and dithiol linking molecules. Their current-voltage characteristics have been measured at different temperatures and shown to exhibit single-electron charging effects even at room temperature. These measurements provide estimates for the resistance of individual molecular wires that correlate well with their theoretical model [1-3].
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